mounttab.c revision 66814 
1/*
2 * Copyright (c) 1999 Martin Blapp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#ifndef lint
29static const char rcsid[] =
30  "$FreeBSD: head/usr.sbin/rpc.umntall/mounttab.c 66814 2000-10-08 09:24:45Z bde $";
31#endif /* not lint */
32
33#include <sys/syslog.h>
34
35#include <rpc/rpc.h>
36#include <nfs/rpcv2.h>
37
38#include <err.h>
39#include <errno.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "mounttab.h"
46
47int verbose;
48struct mtablist *mtabhead;
49
50/*
51 * Add an entry to PATH_MOUNTTAB for each mounted NFS filesystem,
52 * so the client can notify the NFS server even after reboot.
53 */
54int
55add_mtab(char *hostp, char *dirp) {
56	FILE *mtabfile;
57	time_t *now;
58
59	now = NULL;
60	if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL)
61		return (0);
62	else {
63		fprintf(mtabfile, "%ld\t%s\t%s\n",
64		    (long)time(now), hostp, dirp);
65		fclose(mtabfile);
66		return (1);
67	}
68}
69
70/*
71 * Read mounttab line for line and return struct mtablist.
72 */
73int
74read_mtab(struct mtablist *mtabp) {
75	struct mtablist **mtabpp;
76	char *hostp, *dirp, *cp;
77	char str[STRSIZ];
78	char *timep;
79	time_t time;
80	FILE *mtabfile;
81
82	if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) {
83		if (errno == ENOENT)
84			return (0);
85		else {
86			syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB);
87			return (0);
88		}
89	}
90	time = 0;
91	mtabpp = &mtabhead;
92	while (fgets(str, STRSIZ, mtabfile) != NULL) {
93		cp = str;
94		errno = 0;
95		if (*cp == '#' || *cp == ' ' || *cp == '\n')
96			continue;
97		timep = strsep(&cp, " \t\n");
98		if (timep == NULL || *timep == ' ' || *timep == '\n') {
99			badline(timep);
100			continue;
101		}
102		hostp = strsep(&cp, " \t\n");
103		if (hostp == NULL || *hostp == ' ' || *hostp == '\n') {
104			badline(hostp);
105			continue;
106		}
107		dirp = strsep(&cp, " \t\n");
108		if (dirp == NULL || *dirp == ' ' || *dirp == '\n') {
109			badline(dirp);
110			continue;
111		}
112		time = strtoul(timep, (char **)NULL, 10);
113		if (errno == ERANGE) {
114			badline(timep);
115			continue;
116		}
117		if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) {
118			syslog(LOG_ERR, "malloc");
119			fclose(mtabfile);
120			return (0);
121		}
122		mtabp->mtab_time = time;
123		memmove(mtabp->mtab_host, hostp, RPCMNT_NAMELEN);
124		mtabp->mtab_host[RPCMNT_NAMELEN - 1] = '\0';
125		memmove(mtabp->mtab_dirp, dirp, RPCMNT_PATHLEN);
126		mtabp->mtab_dirp[RPCMNT_PATHLEN - 1] = '\0';
127		mtabp->mtab_next = (struct mtablist *)NULL;
128		*mtabpp = mtabp;
129		mtabpp = &mtabp->mtab_next;
130	}
131	fclose(mtabfile);
132	return (1);
133}
134
135/*
136 * Rewrite PATH_MOUNTTAB from scratch and skip bad entries.
137 * Unlink PATH_MOUNTAB if no entry is left.
138 */
139int
140write_mtab() {
141	struct mtablist *mtabp;
142	FILE *mtabfile;
143	int line;
144
145	if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) {
146		syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB);
147			return (0);
148	}
149	line = 0;
150	for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
151		if (mtabp->mtab_host != NULL &&
152		    strlen(mtabp->mtab_host) > 0) {
153			fprintf(mtabfile, "%ld\t%s\t%s\n",
154			    (long)mtabp->mtab_time, mtabp->mtab_host,
155			    mtabp->mtab_dirp);
156			if (verbose) {
157				warnx("write entry " "%s:%s",
158				    mtabp->mtab_host, mtabp->mtab_dirp);
159			}
160			clean_mtab(mtabp->mtab_host, mtabp->mtab_dirp);
161			line++;
162		}
163	}
164	fclose(mtabfile);
165	if (line == 0) {
166		if (unlink(PATH_MOUNTTAB) == -1) {
167			syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB);
168			return (0);
169		}
170	}
171	return (1);
172}
173
174/*
175 * Mark the entries as clean where RPC calls have been done successfully.
176 */
177void
178clean_mtab(char *hostp, char *dirp) {
179	struct mtablist *mtabp;
180	char *host;
181
182	host = strdup(hostp);
183	for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
184		if (mtabp->mtab_host != NULL &&
185		    strcmp(mtabp->mtab_host, host) == 0) {
186			if (dirp == NULL) {
187				if (verbose) {
188					warnx("delete entries "
189					    "host %s", host);
190				}
191				bzero(mtabp->mtab_host, RPCMNT_NAMELEN);
192			} else {
193				if (strcmp(mtabp->mtab_dirp, dirp) == 0) {
194					if (verbose) {
195						warnx("delete entry "
196						    "%s:%s", host, dirp);
197					}
198					bzero(mtabp->mtab_host, RPCMNT_NAMELEN);
199				}
200			}
201		}
202	}
203	free(host);
204}
205
206/*
207 * Free struct mtablist mtab.
208 */
209void
210free_mtab() {
211	struct mtablist *mtabp;
212	struct mtablist *mtab_next;
213
214	for (mtabp = mtabhead; mtabp != NULL; mtabp = mtab_next) {
215		mtab_next = mtabp->mtab_next;
216		free(mtabp);
217		mtabp = mtab_next;
218	}
219}
220
221/*
222 * Print bad lines to syslog.
223 */
224void
225badline(char *bad) {
226
227	syslog(LOG_ERR, "skip bad line in mounttab with entry %s", bad);
228}
229